DMT W8XNB 8-Inch Bench Stone Extra-Coarse with Non-Skid Mat Superior diamond sharpening stones Legendary quality Made in the USA Easy counter or bench use with larger, wider diamond surface for sharpening a variety of knives and edges Extra-Coarse diamond to repair a damaged edge Sharpens knives faster than conventional stones with DMT's monocrystalline diamond surface No oil is needed-sharpen dry or with water Durable construction will provide years of consistent performance and reliable service